RAND Webpage for the RAND think-tank. RAND does a great deal of theoretical work on insurgency and terrorism. Type al Qaeda in the search engine to see what I mean. Also a ton of information on defense issues, most of it free for the taking.

The Defense Technical Information CenterRepository of theses and white papers made on the government dime, all downloadable for free. There’s a company online that sells these papers, basically stealing the work of other people and selling without the author getting a dime. They sell my master’s thesis. Go here and get it for free instead.

Jihadology. A clearinghouse for Jihadi primary source material, original analysis, and translation services. It’s a little heavy academically, but a great reference for everything from the Arab Spring to foreign fighter influence in Syria. Doing a college paper on anything related to Jihad? Check this site out.